Methods, Nodes and Systems in a Communication Network

2. The method of claim 1, wherein the first message further comprises an indication of the type of resource available in the first domain.

5. The method of claim 4, wherein the second message further comprises an indication of an upper limit of the resource in the third domain and the method further comprises comparing the summation to the upper limit.

10. The method of claim 1, wherein the second message further comprises an indication of a path through the communications network from the third domain to the first domain, wherein the path comprises indications of one or more intermediate domains that the indication of a resource available on a third domain has passed through.

15. The method of claim 1, wherein the first node comprises a resource orchestrator and/or forms part of a hierarchical orchestration system.

16. The method of claim 1, wherein the first message comprises a resource advertisement.